I've had something weird for the past few months, it's a bump on my leg that looks a lot like a spider bite or other bug bite, and I sometimes see it in the morning and then within a few hours it's gone. I'm not sure what it is, and it's only there sometimes, and then when it does come out, it goes away within a few hours. What could this be, or be from?

Umh I Really Don't Have an answer but the best thing possible is to go to your doctor and get Checked out..